Has a short-term and long-term cycle

Bacteria found in legumes are an important part of the cylce.

Rarely found in a gaseous from - not found in the atmosphere

Makes up about 78% of the atmosphere

available to producers by rock erosion and decomposition of organisms

excess amounts of this nutrient cause algal blooms

released into the atmosphere as a product of cellular respiration

Must be fixed by bacteri before it is available to other organisms

can be found in soil

burning of fossil fuels releases a large amount of this element back into the atmosphere

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